Numerical Rounding Rules for Medicare

Several questions have arisen about how to handle reporting test results and determining coverage when the values are not whole numbers. This most often occurs for oxygen saturation results (either arterial blood gas or pulse oximetry) and sleep tests, where the apnea/hypopnea index (AHI) or respiratory disturbance index (RDI) results are expressed with a decimal.

In both instances, standard numerical rounding rules apply. For example, consider a sleep test where the AHI is reported as below:

  • If the value is 12.01 to 12.49, round down to 12
  • If the value is 12.50 to 12.99, round up to 13

This is also on the Positive Airway Pressure (PAP) webpage.

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